User Manual

Network Security Controls
Intended Operational Environments
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Figure 20: Multiserver Architecture for Discipline Segmentation or Redundancy
2.2.7 Virtualization
Intended Use Case
Virtualization has become a widely preferred and suggested environment for IT
infrastructure by IT administrators:
● Server (hardware) virtualization is a proven software technology that makes it
possible to run multiple operating systems on the same server at the same time,
sharing the available hardware resources. It simulates the available hardware and
deludes every operating system running on top of it to assume that it is the unique
holder of the resource. The details of the physical environment are kept
transparent from the operating system.
● Add-on options for hardware redundancy allow running the same virtual machine
on multiple physical servers. If a server fails for any reason, another physical
server running the same virtual machine can take its place. This minimizes any
interruption in service.
● Network virtualization creates logical, virtual networks that are decoupled from the
underlying network hardware to ensure the network can better integrate with and
support increasingly virtual environments.
● Further virtualization types are desktop-, application- and service virtualization
Virtualization of clients is not recommended. Depending on the virtualization software,
performance issues (such as, display of multiple video streams or graphic display)
may occur.
Desigo CC supports several server virtualization environments and their redundancy
options, including transparent network virtualization. Terminal Server applications,
Desktop-, Service-, and Application Virtualization are not supported.
The following key components can be virtualized: